Esco Heating 208 Exam Questions And Answers

75. Induced draft furnaces have a vent safety switch that should open at A: 80°F. B: l00°F. C: 120°F. D: 140°F. {Ans: D}56. Metal ductwork tends to transmit noise and fan vibratians to conditioned space in residential installations. What type of connectors are specified to control this? A: Damper eliminating brackets B. Plastic hangers C Vapor barriers D: Flex connectors. {Ans: D}96. A gas furnace installed at altitudes above ______feet needs to have adjustments to operate properly. A:500 B: 1000 C: 1,500 D: 2,000 {Ans: D}61.The National Electrical Code Classification for thermostat wire is: A: NEC Class l B: NEC Class 2 C: NEC Class A D: NEC Class B {Ans: B}98. A spark ignitor operates at______VAC. A: 1,000 B: 5,000 C: 8,000 D: 7,500 and higher {Ans: D}70. A technician lights a spark type ignition furnace.The main burners light, but the spark igniter continues to spark. After 60 seconds, the blower fan comes on and the burner goes out. The technician suspects: A: a faulty fan switch. B: a faulty ignition board C: a faulty pilot bi-metal. D; Either "A" or "C" {Ans: B}14. The ignition temperature of LP gas is: A: 500°F